Shoes for rubbing devices



June 12, 1956 N. T. ANTCN 2,749,679

SHOES FOR RUBBING DEVICES Original Filed Nov. 25, 1953 INVENTORT NICHOLAS ANTON WML MQ W ATTORNEYS SHOES FOR RUBBING DEVICES Nicholas T. Anton, Park Ridge, Ill.

Original application November 25, 1953, Serial No. 394,334. Divided and this application August 16, 1954, Serial No. 450,021

9 Claims. (Cl. 51-189) This application is a division of my co-pending application, Serial No. 394,334, filed November 25, 1953, on Vibratory Tool.

This invention relates to shoes and, more particularly, to shoes which are particularly well adapted for use as sanding or polishing members on vibratory sanders and the like.

It is a primary object of my invention to afford a novel shoe for use in sanding and polishing operations andthe like.

Another object of my invention is to enable sand paper, a polishing cloth, or the like, to be supported on a reciprocable block in a novel and expeditious manner.

Yet another object is to afford a novel shoe of the aforementioned type embodying novel retaining or clamping structure.

A further object is to provide a novel shoe of the aforementioned type embodying novel retaining or clamping devices for sand paper, polishing cloths, or the like, which can be quickly and easily operated and which are positive in retaining operation.

Another object of my invention is to provide a novel shoe of the aforementioned type embodying novel clamp- 1 ing structure which is readily actuated and which during actuation is effective to tension sand paper, a polishing cloth, or the like, in a novel and expeditious manner.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 is a top plan view of a shoe embodying the principles of my invention;

Fig. 2 is a sectional view taken substantially along the I Fig. 7 is a perspective view of a portion of the mechanism shown in Figs. 1 to 6, inclusive; and

'Fig. 8 is a perspective view of the mechanism shown States Patent ice in Fig. 7, with the parts thereof disposed in different operating positions.

To illustrate the principles of my invention, a shoe or block 26, comprising the preferred embodiment of my invention, is shown in the drawings. The block 26 is shown mounted on two supporting members 28 and 29 which extend downwardly from an armature 35 and a core 33, respectively, Fig. 2, of an electromagnet 24 of a vibratory tool 20 of the type discussed in greater detail in my aforementioned copending application, Serial No. 394,334, filed November 25, 1953. It will be noted that the sanding block 26 is shown mounted on the vibratory tool 20 merely by way of illustration and not by way of limitation.

The block 26 includes a plate 62, having an upper face 63 and a lower face 64, and a pad 66 mounted on the lower face 64. The plate 62 may be made of any suitable material, such as, for example, aluminum and the ends and sides thereof are preferably turned down to form end walls or end flanges 68 and 69 and side walls or side flanges 70 and 71 respectively, Figs. 1 and 2. Ribs 74 are preferably formed in the central portion of the plate 62 to thereby stiffen and strengthen the same. The pad 66 may be formed of any suitable material such as felt, rubber, or the like, and is preferably adhesively secured to the lower face 64 and the plate 62 between the flanges 68-71.

In the operation of my novel block or shoe 26, as will be presently described in greater detail, a sheet of sand paper, or polishing coth, or the like, is normally mounted on the lower face of the pad 66, and is firmly held thereon by clamping units 75 and 76, Fig. 3, mounted on the upper face of the plate 62, the clamping units 75 and 76 forming a readily actuated and positively acting device for this purpose, as will be discussed in greater detail hereinafter.

The block 26 may then be caused by the armature 24 to rapidly reciprocate in a forward and rearward direc tion, or, that is, to the right and the left, respectively, as viewed in Fig. 1, to thereby impart a series of rapid reciprocating polishing or sanding strokes to the block 26.

As was previously mentioned, the shoe or block 26 embodies as a part thereof novel clamping units 75 and 76 which are effective to securely and positively hold wiping sheets such as sand paper, polishing cloths, or the like, in operative position on the lower face of the pad66 and are, in addition, effective to automatically tension the sand paper or cloth on the pad 66 during the actuation of the clamping devices into clamping position.

As shown in the drawings the clamping units 75 and 76 each embody a clamping plate 131 and a leaf spring 133. The leaf spring 133 is substantially of a modified W-shaped, Figs. 4, 5 and 6, embodying a long outer leg 135, a short outer leg 136, and two intermediate legs 137 and 138. The short leg 136 has a free end portion 140, and is connected at its opposite end to the end of the leg 138 to form a junction 142 therewith, and the end of the leg 138 opposite the junction 142 is connected to the leg 137 opposite the junction 142 is connected to the leg 135, like the leg 136, has a free end portion 144,

and the end of the leg opposite the free end portion 144 is connected to the end of the leg 137 opposite the junction 143 to form a junction 145.

The clamping plate 131 may be formed of any suitable material, such as, aluminum, and includes an elongated leg 151, having one free longitudinal edge 153. An elongated flange is mounted on the longitudinal edge of the leg 151 opposite the free edge 153 to form a junction 154 therewith along substantially the full length of the leg 151. The flange 155 forms an integral lateral extension of the leg 151 which is disposed at an inwardly angers and upwardly opening obtuse angle to the top plane of the leg when'the leg 151 isdispbsed in normal clamping position, Figs. 3 and 6.

Two ears 157 and 158 project from the ends of the leg 151 in a substantially perpendicular relation thereto and in substantially parallel relation'to each other. Two ears 163 and 164 project from opposite ends of the flange 155 in substantially longitudinal alignment therewithand afford 'handles for actuating the clamping units 75 and 76 as will be discussed presently. Y

An'elongated slot 161 is formed in the longitudinal central portion of the leg 151 in a substantially parallel relation to the free edge 153 thereof, and is disposed adjace'nt to the junction 154 with theflange 155. v

The inner end portion of the leaf spring'133, adjacent the free end 144 of the leg 135 is secured in juxtaposition to 'the'uppe'r face of theplate 62g of the block 26by suitable"mea'ns such as the rivets 79, *Figs. 1, 2 and 5, The other end portion of the leaf spring 133. extends outwardly through the slot 161 and is sodisposed therein that when the'clampingplate '131 is disposed in normal operating positions tl' 1 e 1eg 151 thereof is disposed between th'e'legs' 137 and "1386f the s pring 133, and the junction 1 43 posed in engagementwith, or closely adjacent'to the l edge of the'slot 1 61. In the operation'ofthe clam w device 75 and for apurpose wine I will be discussed in greater detail presentlyfthef clampingf'plate 131 y be ed aroundfthei'ears' 157 and158 between a'fully opeh position shown Fig. 4, and'a fully closedclarnping i1 3 shar a h e 3. in n t .gfhe' me swe 'positionspassin'gthrough an intermediate or em ra y ldina 9i on hown in F n1 thefully open position, shown inFig, 4, the clamping plate 131 is supportedonthe ears 157 and 158 which reston the top face 63 of the plate 62, and the leg 151 is disposed in rearwardly projecting, up'wardlyspaced, slub stant 11y. parallel relation to' the plate 62. In this positio the fr edge of the flange 155, oppositethejunction 154rests on'the upper face 63 'of the plate 6 2, and. the legs '138 'of the spring 133 are disposedin downwardly urgingengagernent with the leg 151 of the plate131. adjac'enttofthffree edge 153 thereof. To retain the clamp ing pl 1 1 in this'pos ition, the operator may manually applydo nward preset-teen the flange '155 or the eags. 1B3'and1 6 4tnefeof.

In'the intermediate or temporary holding position, Eig. 5, theclamping: plate131 is disposed in such position that pn e iei fi h leg n aiming.

of the ea rs l 7"and'158 aredisposed in engagement with rd lyio en i g acute angle to the plate 62, With the. sed. In this position, the leg 138, of, the

faee; ofthelegllfl andthe junction 143is dis;- ns smentwiththe ow r d e of the slot .1.6l.

only. the free edge 153. thereof is engaged with the plate:

62, the flange 155 and the ears 157 and 158 projecting upwardly from the leg 15 1, and the leg 151 being'disposed in 'a rearwardly or outwardly'opening acute'angle'm the plate 62. When the plate 131 is disposed inthi s position thej'spring 133is engag'ed with the plate 131 at three'f places Of c on'tact 'andis effective to 'firmly' but yieldingly' latch the plate 131m this position. Thus, it'will be' seen thatithe junction1 15 is disposed in eng'algernentwith the inwardly disposed face of the leg 151, the leg l3s restision;

. mee i g outw rd of ea wardly... hsfiane 5. an in ed ata orwa dlynn g t sed. n posit n he ou wardly.

y the ing 1 33 is effective to urge the. clamping;

the lower edge of the slot 161, and the free edge portion of the leg 136 is disposed in engagement with the rearwardly or outwardly disposed face of the flange 155.

It will be seen that when the plate 131 is disposed in this position the leg 151 has moved inwardly past the center of rotation of the plate so that the spring is effective to firmly hold the plate 131 in this position and, in effect, urges the plate 131 substantially along the plane of the leg 151. into. clamping engagement with the face 63 of the plate62. To movethe plate 131 from the clamping positionshown in Big. 6 to the intermediate position shown in Fig. 5 the operator may exert forwardly or inwardly directed manual pressure on the flange or the ears 163 or 164 thereof to rotate the plate 131 in a clockwise direction, as viewed in Fig. 6, against the latching action of the spring 131.

The clamping unit 76 is of identically the same construction as the clamping unit 75 and, in fact, the parts of the clamping units 75 and 76 are interchangeable. Therefore, the parts of the clamping unit 76 are identified in, the drawings by the same reference numerals as the parts of the clamping unit 75 but with the suffix a added thereto."

"Inthe operation of my novel shoe, when it is desired to place a wiping sheet such as a sheet of sand paper or a. polishing cloth in operable position on the lower face of the: block 26','this may be quickly and easily accomplished. Firsh, the clamping plate 131 of the clamping unit 75 may be manually moved by the operator into the fully open position shown in Fig.4 and the one end portion of the wiping sheet Sjinay be inserted inwardly under the. leg 151 in a forward direction and parallel to the upper face 63 of thepl ate '62'until that end of the sheet S is. disposed in abutting relation to the ears 157 and 158. The operator may thenrelease the clamping plate 131 of the clamping unit 75 and permit the same to be rotated by the spring 13:3, intofthe temporary holding position shown in Fig, 5. where 'the 'f r fi Qdg 1 3 of the leg 151 is firmly held in positihn" to clamp the rear end portion of the sheet S against the plate 6.2.. The sheet Smay then be extended 't helo'wer faced the block 26 and, with the clampate' 131a of the clamping unit 76. held in fully sitionby: the operator-[the front end portion of d in engagement with the ears 156g and 153a unit 76, 'The operator may then permit late 131 to be rotated into its temporary loose as illu'straitediir Fig. 2. This is normally true because it"is"soriiewh'at difficult to pull the sheet S tightwith one hand while operating a clamping or holding device with the other. .hand. This is one of the difficulties encountered with many of the clamping devices heretofore known. in the art, because with such earlier. devices it was difficult to "ever ge t a sheet of sand paper. or a polishing. clotlrsutficiently tight on a supporting member tofafiofd'fthelf'deisird wiping surface. However, it is immaterial irithepperatio n of my device that whenthe, sheet S, is, disposedin this temporary holding position it somewhat slack on the block 26;b eca use in moving th'e' clamping units 75 and76 -from the temporary holding ppsitions thereof into the aforementioned fully clos'e clarhping. position thereof, the clamping units 75 and76: I effect tov automatically. tension the wiping sh S heese a aeiif' i 1i ii 1. .1 h e s e. n

153a, respectively, thereof are moved inwardly from the outer ends of the block 26 and, during such movement are firmly held by the spring 133 in engagement with the respective rear and front ends of the sheet S and thus are effective to move these rear and front end portions of the sheet S inwardly toward each other along the upper face 63 of the plate 62, thereby taking up the slack in the sheet S and tensioning the sheet S on the block 26.

It will be seen that in releasing a sheet S from clamped position on the block 26, first one of the clamping units 75 or 76, and then the other, need merely be moved by the operator from fully closed position into fully opened position and the corresponding end of the sheet S manually removed from beneath the clamping plate 131.

From the foregoing it will be seen that I have afforded a novel shoe of novel construction and of improved operation.

Also it will be seen that I have afforded a novel shoe wherein a polishing or sanding member is supported and actuated in a novel and expeditious manner.

In addition it will be seen that I have afforded a novel shoe wherein such polishing members or sanding mem bers may be quickly and easily mounted in, and removed from, operative position therein and are held in such position by novel clamping units.

Thus, while I have illustrated and described the preferred embodiments of my invention, it is to be understood that these are capable of variation and modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. A clamp for use on a shoe for a sander, polisher or the like, comprising a clamping plate having a clamping edge, and a leaf spring having one end portion mounted on said plate, and another end portion adapted to be mounted on such a shoe for supporting said plate on the latter, said plate having an open position and an intermediate holding position wherein said edge projects in a general direction away from said other end portion of said leaf spring, said plate having a fully closed position wherein said edge projects in the general direction toward said other end portion, said spring being so engaged with said plate as to urge said plate toward said intermediate position when said plate is disposed in said open position, and to yieldingly retain said plate in said closed position when said plate is disposed in the latter position.

2. A clamp for use on a shoe for a sander, polisher, and the like, comprising a clamping plate having a clamping edge portion, and a substantially modified-W-shaped leaf spring engaged with said clamping plate for mounting said clamping plate in operative position on such a shoe, said spring having two outer legs and two intermediate legs, each of said intermediate legs being joined to a respective one of said outer legs and to each other, one of said outer legs being secured to said shoe when said clamping plate is disposed in said operative position thereon, said clamping plate having a fully open position and a fully closed position when so mounted on said shoe, one of said intermediate legs being engaged with said plate when said plate is disposed in said open position, said one intermediate leg being the intermediate leg joined to the other of said outer legs, said other outer leg, said one intermediate leg, and the other of said intermediate legs, being engaged with said plate when said plate is disposed in said closed position.

3. A clamp for use on a shoe for a sander, polisher, and the like, comprising a clamping plate having a clamping edge portion, and a substantially modified-W-shaped leaf spring engaged with said clamping plate for mounting said clamping plate in operative position on such a shoe, said spring having two outer legs and two intermediate legs, each of said intermediate legs being joined to a respective one of said outer legs and to each other,

one of said outer legs being secured to said shoe when said clamping plate is disposed in said operative position thereon, said clamping plate having a fully open position and a fully closed position when so mounted on said shoe, one of said intermediate legs being engaged with said plate when said plate is disposed in said open position, said one intermediate leg being the intermediate leg joined to the other of said outer legs, said other outer leg, said one intermediate leg, and the other of said intermediate legs, being engaged with said plate when said plate is disposed in said closed position, said other outer leg and said other intermediate leg being so engaged with said plate when the latter is disposed in said closed position as to urge said plate to rotate, said one intermediate leg being so engaged with said plate when the latter is disposed in said position as to resist such rotation of said plate and urge said plate in a direction substantially along the plane of said clamping edge portion.

4. A clamp for use on a shoe for a sander, polisher, and the like, comprising an elongated clamping plate having two oppositely disposed longitudinal edge portions, and a substantially modified-W-shaped leaf spring extending through said clamping plate between said edges for mounting said clamping plate in operative position on such a shoe, said plate, when so mounted on said shoe, having an open position wherein one of said longitudinal edge portions is disposed in upwardly spaced relation to said shoe, an intermediate position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe, and a closed position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe which opens in a generally opposite direction to said first mentioned acute angle, said spring having an outer leg adapted to be attached to said shoe for mounting said plate in said operative position on the latter, said spring also having another outer leg and two intermediate legs, said intermediate legs being joined to respective ones of said outer legs and to each other, and said spring being so engaged with said plate that in all positions of said plate between said fully open and fully closed positions said one edge portion of said plate is disposed between said intermediate legs.

5. A clamp for use on a shoe for a sander, polisher, and the like, comprising an elongated clamping plate having two oppositely disposed longituinal edge portions, and a substantially modified-W-shaped leaf spring extending through said clamping plate between said edges for mounting said clamping plate in operative position on such a shoe, said plate, when so mounted on said shoe, having an open position wherein one of said longitudinal edge portions is disposed in upwardly spaced relation to said shoe, an intermediate position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe, and a closed position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe which opens in a generally op posite direction to said first mentioned acute angle, said spring having an outer leg adapted to be attached to said shoe for mounting said plate in said operative position on the latter, said spring also having another outer leg and two intermediate legs, said intermediate legs being joined to respective ones of said outer legs and to each other, and said spring being so engaged with said plate that in all positions of said plate between said fully open and fully closed positions said one edge portion thereof is disposed between said intermediate legs, said plate having supporting means projecting laterally therefrom, said supporting means being engaged with said shoe when said plate is disposed in said open and intermediate positions, and said supporting means being disposed on the other side of said plate from said shoe when said plate is disposed in said closed position.

6. A clamp for use on a shoe for a sander, polisher, and the like, comprising an elongated clamping plate having two oppositely disposed longitudinal edge portions and a substantially modified W-shaped leaf spring extending thizough said clamping plate between said edges for mounting said clamping plate in operative position on such a shoe, said plate, when so mounted on said shoe, having an open position wherein one of said longitudinal edge portions is disposed in upwardly spaced relation to said shoe, an intermediate position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe, and a closed position wherein said one edge portion is disposed in clamping relation to said shoe and said plate is disposed at an acute angle to said shoe which opens in a generally opposite direction to said first mentioned acute angle, said spring having an outer leg adapted to be secured to said shoe for mounting said plate in said operative position on the latter, said spring also having another outer leg and two intermediate legs, said intermediate legs being joined to respective ones of said outer legs and to each other, said plate having supporting means projecting laterally therefrom, said supporting means being engaged with said shoe when said plate is disposed in said open and intermediate positions and said supporting means being disposed on the other side of said plate from said shoe when said plate is disposed in said closed position, said spring being so engaged with said plate that when said plate is disposed in said open position and said intermediate position the one of said intermediate legs joined, to the other of said outer legs is engaged with said plate, and when said plate is disposed in said closed position said other outer leg, said one intermediate leg, and the other of said intermediate legs are all engaged with said plate.

7. A shoe for a sander, polisher, or the like, comprising a plate having an upper face and a lower face, and means for releasably securing a sheet of material across said lower face, said means comprising two clamps mounted on said upper face in spaced relation to each other andoperable, to clamp edge portions of said sheet on said upper face, each of said clamps comprising a clamping plate having a clamping edge portion thereon for engagement with a sheet, each of said clamping plates having a fully open position wherein said clamping edge portions there of is disposed in outwardly facing relation to the central portion of said first mentioned plate, and each of said clamping plates having a fully closed position wherein said clamping edge portion thereof is, disposed in generally inwardly facing relation to the central portion of said first mentioned; plate, andmeans pivotally and slidably mountin each of said clamping plates on said upper face ofsaidfirst mentioned plate including. apair of leaf springs mounted on said first mentioned plate and each engaged with one of said, clamping plates, for allowing each of said; clamping plates when, moved fromfully opened position toeng age adjacent portions of the sheet outwardly of, the ends thereof and also allow the end portions of' the sheet; to be moved toward each other on the upper face of said plate and to tighte l said sheet across. the lower face of;- said plate when the clamping. plates are moved from the engaging positions tofully closed positions.

8. A shoe for, a sander, polisher, or thelike, comprisinga supporting block, and means for releasably holding a sheegof, material across said block, said means comprising two clamps, each of said clamps comprising a clamping plate having a clamping edge portion thereon, and a pair of leaf springs mounted on said supporting block and each engaged with one of said clamping plates, each of said clamping plates having one position wherein its said clamping edge portion is disposed in substantially directly abutting relation to an end edge portion of such a sheet, each of said clamping plates having a fully open position wherein said clamping edge portion thereof is disposed in spaced relation to said sheet, and each of said clamping plates having a fully closed position wherein said clamping edge portion thereof is engaged with said sheet in clamping engagement therewith, each of said clamping plates being pivotally and slidably mounted on one of said leaf springs through said one position back and forth between said fully open and fully closed positions for allowing each of said clamping plates when moved from fully opened position to engage adjacent portions of the sheet outwardly of the ends thereof and also allow the end portions of the sheet to be moved toward each other on the upper face of said plate and to tighten said sheet across the lower face of said plate when the clamping plates are moved from the engaging positions to fully closed positions.

9. A shoe for a sander, polisher, or the like, comprising a plate having an upper face and a lower face, means for releasably securing a sheet of material across the lower face of said plate, said means including a holding device mounted on the upper face of said plate for releasably holding one end portion of said sheet material on the up-. per face of said plate, said mean-s also including a clamping plate mounted on the upper face of said plate in spaced relation to said holding device and having a clamping edge portion thereon for engagement with the other end portion of said sheet of material and for clamping the said other end portion of said sheet material upon the upper; face of; said plate, said clamping plate having a fully open position wherein said clamping edge portion thereof is disposed in outwardly facing position relative to the entral portion of said first-mentioned plate, said clamping plate having a fully closed position wherein said clamping edge portion thereof is disposed in a generally inwardly facing position relative to the central portion of said first-mentioned plate, and means pivotally and slida-v bly mounting said clamping plate on the upper face of said first-mentionedplate including a leaf spring mounted on said first-mentioned plate and engaged with said clamp ing plate for allowing said clamping plate when moved; from fully opened position to engage the adjacent end portion of the said sheet outwardly of the adjacent end thereof and also. to allow the said other end portion of the said sheet to be moved toward the said one end portion of said sheet on the upper face of said plate and to tighten the said sheet across the lower face of said plate when the said clamping plate is moved from sheet-engaging position to fully closed position.

References Cited in the file of this patent UNITED STATES PATENTS 2,404,105 Smith July 16, 1946 2,490,419 Crosby Dec. 6, 1949 2,519,620 Zasadny et a1 Aug. 22, 1950- 2,530,301 Hoy Nov. 14, 1950- 2,546,087 Burleigh Mar. 20, 1951' 

